On Belt Conveyors that run in one direction only, V-Plow Tail Pulley Belt Cleaners use a rubber or urethane blade to direct the unwanted material on the inside surface of the belt off the return belt.  

On reversing belt conveyors or conveyors that suffer rollback, Diagonal Plow Tail Pulley Belt Cleaners use a rubber or urethane blade to direct the unwanted material off to one side regardless of which direction the belt rotates.